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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007-2012 Siemens AG
4 *
5 * Written by:
6 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
7 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/crc-ccitt.h>
16#include <asm/unaligned.h>
17
18#include <net/mac802154.h>
19#include <net/ieee802154_netdev.h>
20#include <net/nl802154.h>
21
22#include "ieee802154_i.h"
23
24static int ieee802154_deliver_skb(struct sk_buff *skb)
25{
26 skb->ip_summed = CHECKSUM_UNNECESSARY;
27 skb->protocol = htons(ETH_P_IEEE802154);
28
29 return netif_receive_skb(skb);
30}
31
32static int
33ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
34 struct sk_buff *skb, const struct ieee802154_hdr *hdr)
35{
36 struct wpan_dev *wpan_dev = &sdata->wpan_dev;
37 __le16 span, sshort;
38 int rc;
39
40 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
41
42 span = wpan_dev->pan_id;
43 sshort = wpan_dev->short_addr;
44
45 switch (mac_cb(skb)->dest.mode) {
46 case IEEE802154_ADDR_NONE:
47 if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
48 /* FIXME: check if we are PAN coordinator */
49 skb->pkt_type = PACKET_OTHERHOST;
50 else
51 /* ACK comes with both addresses empty */
52 skb->pkt_type = PACKET_HOST;
53 break;
54 case IEEE802154_ADDR_LONG:
55 if (mac_cb(skb)->dest.pan_id != span &&
56 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
57 skb->pkt_type = PACKET_OTHERHOST;
58 else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
59 skb->pkt_type = PACKET_HOST;
60 else
61 skb->pkt_type = PACKET_OTHERHOST;
62 break;
63 case IEEE802154_ADDR_SHORT:
64 if (mac_cb(skb)->dest.pan_id != span &&
65 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
66 skb->pkt_type = PACKET_OTHERHOST;
67 else if (mac_cb(skb)->dest.short_addr == sshort)
68 skb->pkt_type = PACKET_HOST;
69 else if (mac_cb(skb)->dest.short_addr ==
70 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
71 skb->pkt_type = PACKET_BROADCAST;
72 else
73 skb->pkt_type = PACKET_OTHERHOST;
74 break;
75 default:
76 pr_debug("invalid dest mode\n");
77 goto fail;
78 }
79
80 skb->dev = sdata->dev;
81
82 /* TODO this should be moved after netif_receive_skb call, otherwise
83 * wireshark will show a mac header with security fields and the
84 * payload is already decrypted.
85 */
86 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
87 if (rc) {
88 pr_debug("decryption failed: %i\n", rc);
89 goto fail;
90 }
91
92 sdata->dev->stats.rx_packets++;
93 sdata->dev->stats.rx_bytes += skb->len;
94
95 switch (mac_cb(skb)->type) {
96 case IEEE802154_FC_TYPE_BEACON:
97 case IEEE802154_FC_TYPE_ACK:
98 case IEEE802154_FC_TYPE_MAC_CMD:
99 goto fail;
100
101 case IEEE802154_FC_TYPE_DATA:
102 return ieee802154_deliver_skb(skb);
103 default:
104 pr_warn_ratelimited("ieee802154: bad frame received "
105 "(type = %d)\n", mac_cb(skb)->type);
106 goto fail;
107 }
108
109fail:
110 kfree_skb(skb);
111 return NET_RX_DROP;
112}
113
114static void
115ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
116{
117 if (addr->mode == IEEE802154_ADDR_NONE)
118 pr_debug("%s not present\n", name);
119
120 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
121 if (addr->mode == IEEE802154_ADDR_SHORT) {
122 pr_debug("%s is short: %04x\n", name,
123 le16_to_cpu(addr->short_addr));
124 } else {
125 u64 hw = swab64((__force u64)addr->extended_addr);
126
127 pr_debug("%s is hardware: %8phC\n", name, &hw);
128 }
129}
130
131static int
132ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
133{
134 int hlen;
135 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
136
137 skb_reset_mac_header(skb);
138
139 hlen = ieee802154_hdr_pull(skb, hdr);
140 if (hlen < 0)
141 return -EINVAL;
142
143 skb->mac_len = hlen;
144
145 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
146 hdr->seq);
147
148 cb->type = hdr->fc.type;
149 cb->ackreq = hdr->fc.ack_request;
150 cb->secen = hdr->fc.security_enabled;
151
152 ieee802154_print_addr("destination", &hdr->dest);
153 ieee802154_print_addr("source", &hdr->source);
154
155 cb->source = hdr->source;
156 cb->dest = hdr->dest;
157
158 if (hdr->fc.security_enabled) {
159 u64 key;
160
161 pr_debug("seclevel %i\n", hdr->sec.level);
162
163 switch (hdr->sec.key_id_mode) {
164 case IEEE802154_SCF_KEY_IMPLICIT:
165 pr_debug("implicit key\n");
166 break;
167
168 case IEEE802154_SCF_KEY_INDEX:
169 pr_debug("key %02x\n", hdr->sec.key_id);
170 break;
171
172 case IEEE802154_SCF_KEY_SHORT_INDEX:
173 pr_debug("key %04x:%04x %02x\n",
174 le32_to_cpu(hdr->sec.short_src) >> 16,
175 le32_to_cpu(hdr->sec.short_src) & 0xffff,
176 hdr->sec.key_id);
177 break;
178
179 case IEEE802154_SCF_KEY_HW_INDEX:
180 key = swab64((__force u64)hdr->sec.extended_src);
181 pr_debug("key source %8phC %02x\n", &key,
182 hdr->sec.key_id);
183 break;
184 }
185 }
186
187 return 0;
188}
189
190static void
191__ieee802154_rx_handle_packet(struct ieee802154_local *local,
192 struct sk_buff *skb)
193{
194 int ret;
195 struct ieee802154_sub_if_data *sdata;
196 struct ieee802154_hdr hdr;
197
198 ret = ieee802154_parse_frame_start(skb, &hdr);
199 if (ret) {
200 pr_debug("got invalid frame\n");
201 kfree_skb(skb);
202 return;
203 }
204
205 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
206 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_NODE)
207 continue;
208
209 if (!ieee802154_sdata_running(sdata))
210 continue;
211
212 ieee802154_subif_frame(sdata, skb, &hdr);
213 skb = NULL;
214 break;
215 }
216
217 kfree_skb(skb);
218}
219
220static void
221ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
222{
223 struct sk_buff *skb2;
224 struct ieee802154_sub_if_data *sdata;
225
226 skb_reset_mac_header(skb);
227 skb->ip_summed = CHECKSUM_UNNECESSARY;
228 skb->pkt_type = PACKET_OTHERHOST;
229 skb->protocol = htons(ETH_P_IEEE802154);
230
231 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
232 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
233 continue;
234
235 if (!ieee802154_sdata_running(sdata))
236 continue;
237
238 skb2 = skb_clone(skb, GFP_ATOMIC);
239 if (skb2) {
240 skb2->dev = sdata->dev;
241 ieee802154_deliver_skb(skb2);
242
243 sdata->dev->stats.rx_packets++;
244 sdata->dev->stats.rx_bytes += skb->len;
245 }
246 }
247}
248
249void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
250{
251 u16 crc;
252
253 WARN_ON_ONCE(softirq_count() == 0);
254
255 if (local->suspended)
256 goto drop;
257
258 /* TODO: When a transceiver omits the checksum here, we
259 * add an own calculated one. This is currently an ugly
260 * solution because the monitor needs a crc here.
261 */
262 if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
263 crc = crc_ccitt(0, skb->data, skb->len);
264 put_unaligned_le16(crc, skb_put(skb, 2));
265 }
266
267 rcu_read_lock();
268
269 ieee802154_monitors_rx(local, skb);
270
271 /* Check if transceiver doesn't validate the checksum.
272 * If not we validate the checksum here.
273 */
274 if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
275 crc = crc_ccitt(0, skb->data, skb->len);
276 if (crc) {
277 rcu_read_unlock();
278 goto drop;
279 }
280 }
281 /* remove crc */
282 skb_trim(skb, skb->len - 2);
283
284 __ieee802154_rx_handle_packet(local, skb);
285
286 rcu_read_unlock();
287
288 return;
289drop:
290 kfree_skb(skb);
291}
292
293void
294ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
295{
296 struct ieee802154_local *local = hw_to_local(hw);
297
298 mac_cb(skb)->lqi = lqi;
299 skb->pkt_type = IEEE802154_RX_MSG;
300 skb_queue_tail(&local->skb_queue, skb);
301 tasklet_schedule(&local->tasklet);
302}
303EXPORT_SYMBOL(ieee802154_rx_irqsafe);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007-2012 Siemens AG
4 *
5 * Written by:
6 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
7 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/crc-ccitt.h>
16#include <asm/unaligned.h>
17
18#include <net/mac802154.h>
19#include <net/ieee802154_netdev.h>
20#include <net/nl802154.h>
21
22#include "ieee802154_i.h"
23
24static int ieee802154_deliver_skb(struct sk_buff *skb)
25{
26 skb->ip_summed = CHECKSUM_UNNECESSARY;
27 skb->protocol = htons(ETH_P_IEEE802154);
28
29 return netif_receive_skb(skb);
30}
31
32static int
33ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
34 struct sk_buff *skb, const struct ieee802154_hdr *hdr)
35{
36 struct wpan_dev *wpan_dev = &sdata->wpan_dev;
37 struct wpan_phy *wpan_phy = sdata->local->hw.phy;
38 __le16 span, sshort;
39 int rc;
40
41 pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
42
43 span = wpan_dev->pan_id;
44 sshort = wpan_dev->short_addr;
45
46 /* Level 3 filtering: Only beacons are accepted during scans */
47 if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN &&
48 sdata->required_filtering > wpan_phy->filtering) {
49 if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) {
50 dev_dbg(&sdata->dev->dev,
51 "drop non-beacon frame (0x%x) during scan\n",
52 mac_cb(skb)->type);
53 goto fail;
54 }
55 }
56
57 switch (mac_cb(skb)->dest.mode) {
58 case IEEE802154_ADDR_NONE:
59 if (hdr->source.mode != IEEE802154_ADDR_NONE)
60 /* FIXME: check if we are PAN coordinator */
61 skb->pkt_type = PACKET_OTHERHOST;
62 else
63 /* ACK comes with both addresses empty */
64 skb->pkt_type = PACKET_HOST;
65 break;
66 case IEEE802154_ADDR_LONG:
67 if (mac_cb(skb)->dest.pan_id != span &&
68 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
69 skb->pkt_type = PACKET_OTHERHOST;
70 else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
71 skb->pkt_type = PACKET_HOST;
72 else
73 skb->pkt_type = PACKET_OTHERHOST;
74 break;
75 case IEEE802154_ADDR_SHORT:
76 if (mac_cb(skb)->dest.pan_id != span &&
77 mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
78 skb->pkt_type = PACKET_OTHERHOST;
79 else if (mac_cb(skb)->dest.short_addr == sshort)
80 skb->pkt_type = PACKET_HOST;
81 else if (mac_cb(skb)->dest.short_addr ==
82 cpu_to_le16(IEEE802154_ADDR_BROADCAST))
83 skb->pkt_type = PACKET_BROADCAST;
84 else
85 skb->pkt_type = PACKET_OTHERHOST;
86 break;
87 default:
88 pr_debug("invalid dest mode\n");
89 goto fail;
90 }
91
92 skb->dev = sdata->dev;
93
94 /* TODO this should be moved after netif_receive_skb call, otherwise
95 * wireshark will show a mac header with security fields and the
96 * payload is already decrypted.
97 */
98 rc = mac802154_llsec_decrypt(&sdata->sec, skb);
99 if (rc) {
100 pr_debug("decryption failed: %i\n", rc);
101 goto fail;
102 }
103
104 sdata->dev->stats.rx_packets++;
105 sdata->dev->stats.rx_bytes += skb->len;
106
107 switch (mac_cb(skb)->type) {
108 case IEEE802154_FC_TYPE_BEACON:
109 case IEEE802154_FC_TYPE_ACK:
110 case IEEE802154_FC_TYPE_MAC_CMD:
111 goto fail;
112
113 case IEEE802154_FC_TYPE_DATA:
114 return ieee802154_deliver_skb(skb);
115 default:
116 pr_warn_ratelimited("ieee802154: bad frame received "
117 "(type = %d)\n", mac_cb(skb)->type);
118 goto fail;
119 }
120
121fail:
122 kfree_skb(skb);
123 return NET_RX_DROP;
124}
125
126static void
127ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
128{
129 if (addr->mode == IEEE802154_ADDR_NONE) {
130 pr_debug("%s not present\n", name);
131 return;
132 }
133
134 pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
135 if (addr->mode == IEEE802154_ADDR_SHORT) {
136 pr_debug("%s is short: %04x\n", name,
137 le16_to_cpu(addr->short_addr));
138 } else {
139 u64 hw = swab64((__force u64)addr->extended_addr);
140
141 pr_debug("%s is hardware: %8phC\n", name, &hw);
142 }
143}
144
145static int
146ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
147{
148 int hlen;
149 struct ieee802154_mac_cb *cb = mac_cb(skb);
150
151 skb_reset_mac_header(skb);
152
153 hlen = ieee802154_hdr_pull(skb, hdr);
154 if (hlen < 0)
155 return -EINVAL;
156
157 skb->mac_len = hlen;
158
159 pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
160 hdr->seq);
161
162 cb->type = hdr->fc.type;
163 cb->ackreq = hdr->fc.ack_request;
164 cb->secen = hdr->fc.security_enabled;
165
166 ieee802154_print_addr("destination", &hdr->dest);
167 ieee802154_print_addr("source", &hdr->source);
168
169 cb->source = hdr->source;
170 cb->dest = hdr->dest;
171
172 if (hdr->fc.security_enabled) {
173 u64 key;
174
175 pr_debug("seclevel %i\n", hdr->sec.level);
176
177 switch (hdr->sec.key_id_mode) {
178 case IEEE802154_SCF_KEY_IMPLICIT:
179 pr_debug("implicit key\n");
180 break;
181
182 case IEEE802154_SCF_KEY_INDEX:
183 pr_debug("key %02x\n", hdr->sec.key_id);
184 break;
185
186 case IEEE802154_SCF_KEY_SHORT_INDEX:
187 pr_debug("key %04x:%04x %02x\n",
188 le32_to_cpu(hdr->sec.short_src) >> 16,
189 le32_to_cpu(hdr->sec.short_src) & 0xffff,
190 hdr->sec.key_id);
191 break;
192
193 case IEEE802154_SCF_KEY_HW_INDEX:
194 key = swab64((__force u64)hdr->sec.extended_src);
195 pr_debug("key source %8phC %02x\n", &key,
196 hdr->sec.key_id);
197 break;
198 }
199 }
200
201 return 0;
202}
203
204static void
205__ieee802154_rx_handle_packet(struct ieee802154_local *local,
206 struct sk_buff *skb)
207{
208 int ret;
209 struct ieee802154_sub_if_data *sdata;
210 struct ieee802154_hdr hdr;
211 struct sk_buff *skb2;
212
213 ret = ieee802154_parse_frame_start(skb, &hdr);
214 if (ret) {
215 pr_debug("got invalid frame\n");
216 return;
217 }
218
219 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
220 if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR)
221 continue;
222
223 if (!ieee802154_sdata_running(sdata))
224 continue;
225
226 /* Do not deliver packets received on interfaces expecting
227 * AACK=1 if the address filters where disabled.
228 */
229 if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS &&
230 sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS)
231 continue;
232
233 skb2 = skb_clone(skb, GFP_ATOMIC);
234 if (skb2) {
235 skb2->dev = sdata->dev;
236 ieee802154_subif_frame(sdata, skb2, &hdr);
237 }
238 }
239}
240
241static void
242ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
243{
244 struct sk_buff *skb2;
245 struct ieee802154_sub_if_data *sdata;
246
247 skb_reset_mac_header(skb);
248 skb->ip_summed = CHECKSUM_UNNECESSARY;
249 skb->pkt_type = PACKET_OTHERHOST;
250 skb->protocol = htons(ETH_P_IEEE802154);
251
252 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
253 if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
254 continue;
255
256 if (!ieee802154_sdata_running(sdata))
257 continue;
258
259 skb2 = skb_clone(skb, GFP_ATOMIC);
260 if (skb2) {
261 skb2->dev = sdata->dev;
262 ieee802154_deliver_skb(skb2);
263
264 sdata->dev->stats.rx_packets++;
265 sdata->dev->stats.rx_bytes += skb->len;
266 }
267 }
268}
269
270void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
271{
272 u16 crc;
273
274 WARN_ON_ONCE(softirq_count() == 0);
275
276 if (local->suspended)
277 goto free_skb;
278
279 /* TODO: When a transceiver omits the checksum here, we
280 * add an own calculated one. This is currently an ugly
281 * solution because the monitor needs a crc here.
282 */
283 if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
284 crc = crc_ccitt(0, skb->data, skb->len);
285 put_unaligned_le16(crc, skb_put(skb, 2));
286 }
287
288 rcu_read_lock();
289
290 ieee802154_monitors_rx(local, skb);
291
292 /* Level 1 filtering: Check the FCS by software when relevant */
293 if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) {
294 crc = crc_ccitt(0, skb->data, skb->len);
295 if (crc)
296 goto drop;
297 }
298 /* remove crc */
299 skb_trim(skb, skb->len - 2);
300
301 __ieee802154_rx_handle_packet(local, skb);
302
303drop:
304 rcu_read_unlock();
305free_skb:
306 kfree_skb(skb);
307}
308
309void
310ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
311{
312 struct ieee802154_local *local = hw_to_local(hw);
313 struct ieee802154_mac_cb *cb = mac_cb_init(skb);
314
315 cb->lqi = lqi;
316 skb->pkt_type = IEEE802154_RX_MSG;
317 skb_queue_tail(&local->skb_queue, skb);
318 tasklet_schedule(&local->tasklet);
319}
320EXPORT_SYMBOL(ieee802154_rx_irqsafe);